Renesas 7700 FAMILY, User Manual

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PROM VERSION
7751 Group User’s Manual 18–3
18.1 EPROM mode
The PROM version can select the normal operating mode which performs the same operation as that of the
mask ROM version, or the EPROM mode which enables to program/read to/from the built-in PROM.
______
When “L” level is input to the RESET pin, the PROM version enters the EPROM mode.
18.1.1 Pin description
Table 18.1.2 lists the pin description in the EPROM mode.
Table 18.1.2 Pin description in EPROM mode
18.1 EPROM mode
Input/Output
––
Input
Input
Input
Output
Output
––
Input
Input
Input
I/O
Input
Input
Input
Input
Input
Input
Name
Power source input
V
PP
input
Reset input
Clock input
Clock output
Enable output
Analog power source input
Reference voltage input
Address input (A
0
–A
7
)
Address input (A
8
–A
15
)
Data input/output (D
0
–D
7
)
Input port P3
Input port P4
Control input
Input port P5
Input port P6
Input port P7
Input port P8
Pin
V
CC
, V
SS
CNV
SS
BYTE
______
RESET
X
IN
X
OUT
_
E
AV
CC
, AV
SS
V
REF
P0
0
–P0
7
P1
0
–P1
7
P2
0
–P2
7
P3
0
–P3
3
P4
0
–P4
7
P5
0
P5
1
P5
2
P5
3
–P5
6
P5
7
P6
0
–P6
7
P7
0
–P7
7
P8
0
–P8
7
Functions
Apply 5 V ± 10% to V
CC
pin, and 0 V to V
SS
pin.
Apply V
PP
level when programming or verifying.
Connect to V
SS
pin.
Connect a ceramic resonator or a quartz-crystal
oscillator between X
IN
and X
OUT
pins. When an
external generated clock is input, the clock must
be input to X
IN
pin, and X
OUT
pin must be left open.
Open.
Connect AV
CC
pin to V
CC
pin and AV
SS
pin to V
SS
pin.
Connect to V
SS
pin.
Input pins for A
0
–A
7
of addresses.
Input pins for A
8
–A
15
of addresses.
I/O pins for data D
0
–D
7
.
Connect to V
SS
pin.
Connect to V
SS
pin.
_____
P5
0
functions as PGM input pin.
___
P5
1
functions as OE input pin.
___
P5
2
functions as CE input pin.
Connect to V
CC
pin.
Connect to V
SS
pin.
Connect to V
SS
pin.